Differential Nutrient Inadequacy Among Vietnamese Youth: Results of a Multi-Location and Multi-Group 24-Hour Recall Survey.

Background: Vietnam is undergoing a rapid nutrition transition, yet evidence on nutrient intake and inadequacy among adolescents and young adults remains limited. This study aimed to assess nutrient intakes and patterns of inadequacy among Vietnamese youth aged 16-25 years across population groups and regions. Methods: A cross-sectional study was conducted among 1005 participants from five provinces in northern, central, and southern Vietnam. Dietary intake was assessed using a two-stage 24 h recall, and nutrient inadequacy was evaluated using Estimated Average Requirement (EAR), Acceptable Macronutrient Distribution Range (AMDR), and Estimated Energy Requirement (EER) reference standards. Results: Energy and macronutrient intakes differed across groups. University students had the lowest energy intake, while young workers consumed the highest proportion of carbohydrates. Calcium inadequacy exceeded 95% in all subgroups. Regional disparities were observed, with lower intakes of several micronutrients in the South. Compared with high school students, university students showed higher risks of inadequate protein and vitamin A intake, whereas young workers exhibited lower risks of inadequate carbohydrate and folate intake but a higher risk of vitamin A inadequacy. Conclusions: Vietnamese youth exhibited substantial micronutrient inadequacies with marked variation across groups and regions. These findings underscore the need for targeted nutrition interventions tailored to specific youth contexts.